This is a pack of ten 8-32 x 1/2" "High Strength" Button Head Screws from ProTek R/C. These are made from standard grade 8 steel which has a minimum tensile strength of 180,000 PSI. These screws are the strongest you can get and are suitable for the most demanding applications! Most manufacturer brand standard screws are not grade 8 steel, so these are a great upgrade for your car, truck or helicopter!